An escarpment (or scarp) is a type of cliff, formed by the movement of a geologic fault, or a landslide. Most cliffs have some form of scree slope at their base. In arid areas or under high cliffs, these are generally exposed jumbles of fallen rock. In areas of higher moisture, a soil slope may obscure the talus.
Primary Muscles. The primary muscles the plank works are the erector spinae, the rectus abdomimus and the transverse abdominus. The erector spinae is a large muscle that runs up the length of the back. It surrounds your spine and allows you to straighten your back and rotate side to side.he plank is one of the simplest and most effective abdominal exercises. In its most basic form, you brace yourself at the top of a pushup while contracting your core muscles. You can do multiple variations of the plank to create more challenge and target different parts of the core.
How to do the Plank Exercise. According to the American Council on Exercise, the plank exercise is one of the top ten abdominal exercises. This exercise is a great way to flatten your stomach, strengthen your core and improve the endurance of your back and stomach muscles. By strengthening your core, you will strengthen your hips and pelvic floor. Having a strong core, stomach and back muscles will lead to improved posture and may help prevent injuries.